Ten patients were initially taken to Jamaica Hospital Medical Center in Queens after the incident. An eleventh patient sought treatment for unrelated symptoms later in the day, a Jamaica Hospital representative told TIME. Ten patients had been discharged by Thursday afternoon, according to hospital representatives, while one was admitted for influenza treatment.

About 100 people aboard Emirates Flight 203 from Dubai complained of illness, citing symptoms like cough and fever. Emirates said Wednesday that 10 passengers “were taken ill.”

Eric Phillips, press secretary for New York City Mayor Bill de Blasio, said test results on the 10 patients initially taken to the hospital found influenza. Some test results came back inconclusive on other viruses, which is a common occurrence, he said. Those tests will be re-administered Thursday.

“All 10 patients will be kept in the hospital as a precaution until we know those final results,” Phillips said.

Test results on the 10 hospitalized patients find influenza. Some tests came back inconclusive on other viruses, which is common. They’ll be re-administered this morning. All 10 patients will be kept in the hosipital as a precaution until we know those final results. https://t.co/t4gOEkHJDN